You might be a fat boy if....
your belly gets in the way of typing on a keyboard.
you graze both nipples whenever you reach across your body.
scratching a fat roll involves lifting up other rolls to get at the itchy part.
doctors have to put you on the "cattle" size scale that accepts wheelchairs just to weigh your fat ass. lol
people are amazed that you fit in a full size sedan, and getting out of it is like watching clowns getting out of a clown car....

We had an IT guy in the office the other day, dealing with a malfunctioning PC, who was approaching this state.

I thought of the FFAs here, when he got down on his knees under a desk to check whether a cable was plugged in.

Haha... well that's just about me at this point. Just invested in a 500lb rated office chair that reclines so I can lean back and put the keyboard on my belly when I get tired of keeping perfect posture.
Fortunately I have a big desk so I keep the desktop on my desk to avoid having to crawl around lol.

You're riding with a partner on an airplane at night, you bend down looking for something under the seat in front of you, your t-shirt slides up in the back, and you feel a hand slowly running itself over your love handle, then gently squeezing. You freeze as the hand mashes, pulls and then wiggles the handle from the left to the right.